And scoeing pasteboaed



- UNITED STATES- PATn vi; OFFICE.

EMIL SALTZKORN AND LUDIVIG NICOLAI, OF DRESDEN, GERMANY.

KNIFE FOR CUTTING AND. SCORING PASTEBOARD.

SPECIFICATION forming part of Letters Patent No. 442,738, dated December16, 1890.

Application filed May 22,1890. Serial No. 352,737. (No model.) Patentedin Germany April 21, 1889, No. 50,356; in England April 23, 1889, No.6,797; in France April 29. 1889, No. 197,841; in Belgium May 15. 1889,No. 86,006, and in Austria- Hungary March 15,1890,No.40 and No. 719.

To all whom it may concern.-

Be it known that we, EMIL SALTZKORN and LUDWIG NIooLAI, subjects of theKing of Saxony, and residents of the city of Dresden, in theKingdoin ofSaxony,in the German Empire, have invented certain new and usefulImprovements in or relating to Knives for Cutting or Scoring Pasteboardand other Analogous Materials, (for which we have obtained LettersPatent of Great Britain, No. 6,797, dated April 23,1889; in Germany, No.50,356, dated April 21, 1889; in Belgium, No. 86,006, dated May 15,1889; in France, No. 197,841, dated April 29, 1889, and inAustria-Hungary, No. A0 and No. 719, dated March 15, 1890,) of which thefollowing is a specification.

.The object of this invention is a knife for scoring card-board to beused in the manufacture of boxes and the like.

Owing to its peculiar form, this knife acts upon the card-board at threedifferent points at the same time, and only scores it. By this means theknife is enabled to perform its work more easily and its action upon thecardboard is rendered less forcible than the device used for the samepurpose hitherto, and, lastly, a sharper and more serviceable cut isobtained.

In the accompanying drawings, Figure 1 is aplan of the knife viewed frombelow. Fig. 2 is a section thereof; Fig. 3, a front view; Fig. 4, apiece of card-board considerably enlarged; and Fig. 5, the same piece,also enlarged and bent. at the cut or scored part. Fig. 6 is a side viewof a modification of the scoring-knife, and Fig.7 a front v1ew thereof.

To a stock a, preferably of rectangular form, is attached theknife-holder b, which is adj ustable in a groove and carries theimproved scoring-knife c. This knife is miteror wedge shaped, as shownat Figs. 1 and 8, and has a straight cutting-edge o. It is flattened atits backward portion, where it is attached to the knife-holder by meansof screws. Being embedded in a groove provided for the purpose in theholder b, it is prevented from lateral displacement. In front the knifeterminates in a swallow-tail formed of two curved blades or cutters c 0set at an angle to each other.

The card is supposed to be placed on a table 1, moved along by a carrieror feed-roller to. (See Fig. 2.) iVhen it is thus brought under theknife, the curved blades begin by effecting a flat and rather shallowout, which, however, grows deeper gradually, and the action of the knifeupon the card-board is thereby rendered less abrupt and sharp than itwould be if the deepest out were made at once, so that card-board of aninferior quality and containing more wood can be operated upon withoutany fear of the blades slipping off or' of the card-board being torn.This scoringknife also admits of a much easier operation of the machine,this, as well as the advantage mentioned before, being due to thedistribution of the resistance over the larger surface of the tool andthe various directions of its action. 7 I

In the modification shown in Figs. 6 and 7 the knife, instead of beingmiter-shaped, has the form of a plowshare. Here, too, however, thestraight blade 0 divides into two curved ones 0 c inclined toward eachother. The knife is attached to the knife-carrier b by means of its sidepiece or extension 0 which is screwed thereto by bolts cl d. Theplowshare form of the knife permits an easier removal of the chippings,so that the whole surface of the out is better exposed to view.

By the combination of the two curved blades with a straight one a outsuch as represented in Fig. 4 is obtained. This peculiar shape of thecut is of great advantage in making bandboxes and the like, inasmuch aswhen the card-board is bent at right angles the gradual y-flatteningedges of the cut leave a space between them, whereby some play isallowed to the compressed portions of the joint, and when it is desiredto apply the glue within the box the same is by the shape of the cutenabled the better to enter the joint.

We claim- A miter or wedge shaped scoring-knife for card-board or thelike, having the straight blade 0' bifurcated at the front end andformed into two forwardly and upwardly curved blades 0 substantially asdescribed.

In testimony whereof we affix our signatures in presence of twowitnesses.

EMIL SALTZKORN. LUDWIG NICOLAI.

Witnesses:

RiiDoLF SCHMIDT, ERNST LEHMANN.

